CN115815375B - Lead screw straightening device and straightening method thereof - Google Patents
Lead screw straightening device and straightening method thereof Download PDFInfo
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- CN115815375B CN115815375B CN202310134682.4A CN202310134682A CN115815375B CN 115815375 B CN115815375 B CN 115815375B CN 202310134682 A CN202310134682 A CN 202310134682A CN 115815375 B CN115815375 B CN 115815375B
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Abstract
The invention relates to the technical field of screw rod straightening. In particular to a screw straightening device and a straightening method thereof, comprising the following steps: a main body provided with a workbench and a supporting table; the supporting table is arranged on the workbench; the clamping seats are arranged at two ends of the workbench and used for fixing the screw rods to be straightened, and the clamping claws are arranged on the clamping seats and can drive the screw rods to be straightened to rotate and move in the axial direction; the strain gauge is provided with a strain gauge nut which is sleeved on the screw rod to be straightened, when the nut moves from one end to the other end relative to the screw rod to be straightened, the nut passes through the deformation area of the screw rod to be straightened, the deformation is transmitted to the nut, the strain gauge receives a deformation signal of the nut and then is converted into a deformation track of the screw rod to be straightened, and therefore the maximum deformation position and the maximum deformation amount of the screw rod to be straightened are determined. And the whole device can realize the whole process of measuring and straightening by circularly measuring and straightening for many times until the maximum deformation of the screw rod to be straightened is less than or equal to the deformation threshold, thereby reducing the straightening cost and improving the straightening efficiency.
Description
Technical Field
The invention belongs to the technical field of screw straightening, and particularly relates to a screw straightening device and a screw straightening method.
Background
The screw is the most commonly used transmission element on tool machinery and precision machinery, and the main function of the screw is to convert rotary motion into linear motion or torque into axial repeated acting force, and the screw is mainly a ball screw, and the precision of the screw is a key functional component of a numerical control machine tool and directly influences the precision of the whole equipment. Because the screw rod is a slender rod-shaped part, belongs to a flexible part, has poor rigidity, is extremely easy to deform, and has machining errors such as straightness, cylindricity and the like, the screw rod is usually required to be straightened after being machined. As described in the CN208213980U patent, a screw straightening machine is described, which indicates that the existing screw straightening generally requires a worker to determine the bending position of the screw by visually observing a lever dial indicator, and then manually place the screw on a fixed bracket and trim the screw by the straightening machine. The problem is that the quality of the ball screw is completely dependent on the operation level of operators, and the accuracy and stability of the screw are greatly affected.
Disclosure of Invention
The invention solves the problems that: manually trimming the lead screw results in poor lead screw quality.
In order to solve the above problems, an embodiment of the present invention provides a lead screw straightening device, including: the machine body is provided with a workbench and a supporting table; the supporting table is arranged on the workbench; the clamping seat is arranged at least one end of the workbench and used for fixing a screw rod to be straightened, the clamping seat is provided with a clamping jaw, the clamping jaw can drive the screw rod to be straightened to rotate and move in the axial direction, and the clamping seat and the clamping jaw can move synchronously in the axial direction; the nut is sleeved on the screw rod to be straightened, the strain gauge is arranged on the nut, when the nut moves from one end to the other end relative to the screw rod to be straightened, the deformation of the nut is transmitted to the nut through the deformation area of the screw rod to be straightened, the strain gauge receives a deformation signal of the nut and then is converted into a deformation track of the screw rod to be straightened, and therefore the maximum deformation position and the maximum deformation amount of the screw rod to be straightened are determined; the support frame is arranged at the bottom of the workbench and can move up and down along the direction vertical to the axial direction of the screw rod to be straightened; the pressure head is arranged above the supporting table, can move up and down through the driving device and presses the lead screw to be straightened, so that the straightening effect is realized; the control system is arranged on the workbench and comprises a display screen and an operation panel, and can receive the strain gauge and the clamping jaw; and/or, signals of the clamping seat, the supporting frame and the pressure head are translated, and the control system can drive the clamping jaw; and/or movement of the cartridge, the support and the ram.
As a further improvement of the present invention, the strain gauge is stuck inside the nut, and deformation of the nut can be detected.
As a further improvement of the invention, the nut comprises a first nut block and a second nut block, the first nut block and the second nut block are respectively arranged at two sides of the supporting table, the first nut block and the second nut block can stretch along the direction vertical to the axial direction of the screw rod to be straightened under the action of the driving device to realize the combination of the first nut block and the second nut block, the nut is formed into a whole and sleeved on the screw rod to be straightened, or the first nut block and the second nut block shrink along the direction vertical to the axial direction of the screw rod to be straightened under the action of the driving device to realize the separation of the first nut block and the second nut block.
As a further improvement of the invention, the number of the supporting frames is two, when the screw rods to be straightened are required to be straightened, the driving device drives the two supporting frames to move upwards until the screw rods to be straightened are supported, and the pressure head moves downwards to press the screw rods to be straightened, so that the straightening effect is realized.
As a further improvement of the invention, a supporting seat is arranged on one side of the clamping seat facing the screw rod to be straightened, and when the clamping jaw loosens the screw rod to be straightened, the supporting seat supports the screw rod to be straightened.
As a further improvement of the invention, an ultrasonic vibration generating device is arranged on the pressure head.
A method of aligning a lead screw, comprising:
s1: at least one end of a screw rod to be straightened is fixed in the clamping jaw, two ends of the screw rod to be straightened form a straight line, and the straight line is used as a reference shaft to set a deformation threshold;
s2: the nut is sleeved at one end of the lead screw to be straightened, the lead screw to be straightened rotates and moves axially, the nut moves from one end to the other end relative to the lead screw to be straightened, the control system collects and translates strain gauge signals to form a three-dimensional model of the lead screw to be straightened, and the control system automatically determines the maximum deformation position and the maximum deformation amount;
s3: comparing the maximum deformation amount with a deformation threshold, if the maximum deformation amount is greater than the deformation threshold, entering S4, and if the maximum deformation amount is less than or equal to the deformation threshold, entering S6;
s4: the claw is rotated and adjusted to the maximum deformation position through the control system to move to the lower part of the pressure head, the support frame moves upwards to support the lead screw to be straightened, the nut is removed, the pressure head is aligned with the maximum deformation position and moves downwards until the pressure head abuts against the maximum deformation position, the claw loosens two ends of the lead screw to be straightened, and the pressure head continues to move downwards to press the maximum deformation position, so that the straightening effect is realized;
s5: returning the pressure head, clamping the end part of the screw rod to be straightened by the clamping jaw, returning the support frame, and repeating the step S2;
s6: and (5) ending the straightening process, loosening the clamping jaw, and taking down the lead screw to be straightened.
As a further improvement of the invention, in S4, the pressure generated by the pressure head is more than or equal to the yield strength of the lead screw, and the pressure is kept for 5-10 seconds after the pressure head is pressed in place.
As a further improvement of the present invention, in S4, an ultrasonic vibration generating device is provided on the ram, and ultrasonic vibration is simultaneously started when the ram is pressed down.
As a further improvement of the present invention, in S4, the ultrasonic vibration generated by the ultrasonic vibration generating device is high-frequency vibration in the vertical direction.
As a further improvement of the invention, the nut comprises a first nut block and a second nut block, which are respectively arranged at two sides of the supporting table; in S2, the first nut block and the second nut block can stretch along the direction perpendicular to the axial direction of the screw rod to be straightened under the action of the driving device to realize that the first nut block and the second nut block are combined to form a nut which is integrally sleeved at one end of the screw rod to be straightened; in S4, the nut removing is that the first nut block and the second nut block shrink along the direction perpendicular to the axial direction of the screw rod to be straightened under the action of the driving device to realize the separation of the first nut block and the second nut block, so that the nut removing action is realized.
Based on the technical scheme, the embodiment of the invention at least has the following technical effects:
the invention provides a screw straightening device, which is characterized in that a nut with a strain gauge is sleeved at one end of a screw to be straightened, the nut moves from one end to the other end relative to the screw to be straightened, deformation information of the screw to be straightened is collected, the maximum deformation position is determined, the nut is removed, the screw to be straightened is precisely straightened, and the whole device can realize the whole measuring and straightening process by circularly measuring and straightening for a plurality of times until the maximum deformation of the screw to be straightened is less than or equal to a deformation threshold value, is applicable to screws of different types, has high adaptation degree, high accuracy and good straightening effect, and the whole method is simple and easy to implement, effectively reduces the straightening cost and improves the straightening efficiency.
The screw rod straightening device has the advantages that the screw rod consists of the first screw rod block and the second screw rod block, the installation and the removal of the screw rod are effectively simplified, and the problem that the maximum deformation position of the screw rod to be straightened cannot be accurately determined because the screw rod to be straightened must be integrally moved to enable the screw rod to be moved to one end of the screw rod to be straightened and then sleeved or moved out in the integral nut installation and removal process is avoided. The first nut block and the second nut block can stretch along the direction perpendicular to the axial direction of the screw to be straightened under the action of the driving device to realize that the first nut block and the second nut block are combined to form a nut which is integrally sleeved at one end of the screw to be straightened, so that the installation of the nut is realized, the first nut block and the second nut block shrink along the direction perpendicular to the axial direction of the screw to be straightened under the action of the driving device to realize the separation of the first nut block and the second nut block, the removal of the nut is realized, and the screw to be straightened is not required to move.
The lead screw straightening device can realize full-automatic operation from detection to a straightening process, reduces errors caused by manual operation of workers, has a better straightening effect, and improves the accuracy and stability of the lead screw.
According to the invention, through multiple detection and straightening processes, the straightening error can be reduced to the greatest extent, and the straightening effect of the screw rod is controlled within the preset deformation threshold range.
According to the invention, the ultrasonic vibration generating device is arranged on the pressure head, and the ultrasonic vibration is started simultaneously when the pressure head is pressed downwards, so that the ultrasonic vibration is overlapped with the downward pressure, and the straightening effect is effectively improved.
The invention integrates multiple procedures of detection, alignment and the like, has simpler structure and better alignment effect, and solves the problems of complex structure and single function of the traditional alignment device.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings to be used in the description of the embodiments will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art;
fig. 1 is a schematic view showing the overall structure of a screw straightening device according to a first embodiment of the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;
fig. 3 is a schematic view showing a structure of a screw straightening device in a measuring state according to a first embodiment of the present invention;
fig. 4 is a schematic view showing a structure of a screw straightening device in a straightened state according to a first embodiment of the present invention;
FIG. 5 is a schematic view of the hidden support stand of FIG. 4;
FIG. 6 is a schematic view of the structure of FIG. 5 from another perspective;
fig. 7 is a schematic structural view of a screw straightening device according to a second embodiment of the present invention;
fig. 8 is a flow chart of a method of aligning a lead screw according to the present invention.
Reference numerals illustrate:
100. a main body of the main body; 110. a work table; 111. a clamping seat; 112. a claw; 113. a guide rod; 114. a protruding foot; 115. a support frame; 116. a support base; 120. a support table; 1201. a nut; 121. a first nut block; 122. a second nut block; 123. a pressure head; 124. an ultrasonic vibration generating device; 125. a strain gage; 130. a control system; 200. and (5) straightening the lead screw.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the following describes the technical solutions provided in detail with reference to fig. 1 to 8.
[ first embodiment ]
Referring to fig. 1 to 6, in a specific embodiment, the present invention provides a screw straightening device, comprising: a main body 100 and a lead screw 200 to be straightened.
The main body 100 is provided with a workbench 110, a supporting table 120 and a control system 130; the table 110 is provided below the body main body 100 as a base. The support table 120 is fixedly installed on the table 110. The working table 110 is provided with a screw rod 200 to be straightened, and the supporting table 120 is of a frame structure and is arranged along the axial direction perpendicular to the screw rod 200 to be straightened.
Clamping bases 111 are arranged at two ends of the workbench 110, clamping claws 112 are arranged at the clamping bases 111, two ends of a screw rod 200 to be straightened are respectively fixed in the clamping claws 112, a nut 1201 is arranged on the supporting table 120, the nut 1201 is sleeved on the screw rod 200 to be straightened, and a strain gauge 125 is adhered to the nut 1201.
Further, the clamping jaw 112 is a clamping jaw 112 arranged on a triangular chuck, and can clamp two ends of the screw 200 to be straightened. The screw rod 200 to be straightened is driven by the clamping jaw 112 to rotate and drive the clamping seat 111 to axially move along the screw rod 200 to be straightened. In the invention, the clamping seat 111 can move along the axial direction of the screw rod 200 to be straightened, so that the integral acquisition of the deformation information of the screw rod 200 to be straightened is realized. Specifically, the bottom of the clamping seat 111 and the top of the workbench 110 form a sliding rail structure with concave-convex matching shape. Thus, when the screw 200 to be straightened moves axially, the clamping seat 111 moves synchronously with the screw 200 to be straightened. In this embodiment, the sliding structure of the card holder 111 and the workbench 110 is: the bottom of the workbench 110 is provided with a guide rod 113 parallel to the screw rod 200 to be straightened, the bottom of the clamping seat 111 is provided with a convex foot 114 extending to the bottom of the workbench 110, and the convex foot 114 is sleeved on the guide rod 113.
Further, a nut 1201 is disposed on the supporting platform 120, the nut 1201 is sleeved on the screw 200 to be straightened, a strain gauge 125 is adhered to the nut 1201, the strain gauge 125 can be adhered to the outer side of the nut 1201 or the inner side of the nut 1201, when the nut 1201 moves from one end to the other end relative to the screw 200 to be straightened, the nut 1201 passes through a deformation area of the screw 200 to be straightened, deformation is transmitted to the nut 1201, the strain gauge 125 receives a deformation signal of the nut 1201 and is converted into a deformation track of the screw 200 to be straightened, and therefore the maximum deformation position and the maximum deformation amount of the screw 200 to be straightened are determined. In the invention, the nut 1201 is fixedly arranged, the nut 1201 internally comprises threads corresponding to the screw 200 to be straightened, a plurality of balls are arranged in the threads, a circulating rollaway race connected with the threads is arranged in the nut 1201, the balls can circularly roll, the claw 112 drives the screw 200 to be straightened to axially rotate relative to the nut 1201 under the action of a driving device, the screw 200 to be straightened is required to axially move simultaneously due to the design of the shape of the threads, the clamping seat 111 and the screw 200 to be straightened synchronously move until the screw 200 to be straightened moves from one end to the other end relative to the nut 1201, and the strain gauge 125 is enabled to collect all deformation information of the screw 200 to be straightened. The whole deformation track of the screw rod 200 to be straightened is determined in a full-automatic mode, the maximum deformation position and the maximum deformation amount of the screw rod 200 to be straightened can be easily determined, the straightening of the screw rod is not required to depend on the experience of workers in the prior art, the rotating screw rod is required to be moved by the workers, the bending position of the screw rod is determined by observing the lever dial indicator with naked eyes, the whole process is simple and easy to implement, the accuracy is higher, and errors caused by manual operation are avoided.
Preferably, the axial rotation and axial movement of the screw 200 to be straightened relative to the nut 1201 can be set such that the clamping seat 111 drives the screw 200 to be straightened to move axially under the action of the driving device, and the clamping seat 111 pushes the screw 200 to be straightened to move axially, so that the screw 200 to be straightened rotates axially relative to the nut 1201 and drives the clamping jaw 112 to rotate synchronously. In this solution, the clamping seat 111 is actively moved by the driving means, and the clamping jaw 112 is passively rotated.
Further, in this embodiment, the nut 1201 includes a first nut block 121 and a second nut block 122, where the first nut block 121 and the second nut block 122 are respectively disposed on two sides of the supporting table 120, and the first nut block 121 and the second nut block 122 can stretch along a direction perpendicular to the axial direction of the screw 200 to be straightened under the action of the driving device to achieve combination of the two, so as to form a nut 1201, and the nut 1201 is integrally sleeved on the screw 200 to be straightened, or the first nut block 121 and the second nut block 122 shrink along a direction perpendicular to the axial direction of the screw 200 to be straightened under the action of the driving device to achieve separation of the two. The arrangement effectively simplifies the installation and removal of the nut 1201, and also avoids the problem that the screw 200 to be straightened cannot be accurately determined in the maximum deformation position of the screw 200 to be straightened because the screw 200 to be straightened must be integrally moved to move the nut 1201 to one end of the screw 200 to be straightened and then be sheathed or moved out in the integral nut installation and removal process. In addition, if the integral nut is not removed, the subsequent alignment process is easy to be influenced, the screw rod 200 to be aligned needs to be pressed in the alignment process to generate new deformation so as to offset the original deformation, if the integral nut is not removed, the placement of the pressure head 123 and the support frame 115 is easy to be influenced, and the structure of the integral nut is easy to be influenced by the alignment deformation of the screw rod 200 to be aligned in the alignment process, so that the alignment effect is influenced, and the service life of the nut 1201 is also reduced.
Specifically, the strain gauge 125 is disposed on the first nut block 121; and/or, the strain gauge 125 may be disposed on the outer side of the nut 1201 on the inner side of the second nut block 122, but when the strain gauge 125 is disposed on the outer side, the signal received by the strain gauge 125 is relatively weak on the inner side, which is easy to affect the reduction of the deformation track of the screw 200 to be straightened. However, for an integral nut, the strain gage 125 is more difficult to operate on the inside of the nut 1201 and is relatively easier to place on the outside. And for the first nut block 121 and the second nut block 122 which are arranged in a split way, the strain gauge 125 can be directly stuck on the inner side of the nut 1201 block, so that the operation is simple, the signal is more sensitive, and the accuracy of restoring the deformation track is higher.
The driving device is usually a motor or an oil cylinder.
Further, as shown in fig. 5 and 6, the bottom of the workbench 110 is provided with two supporting frames 115, in this embodiment, the two supporting frames 115 can move up and down along the axial direction perpendicular to the screw 200 to be straightened under the action of the driving device, but cannot move along the axial direction. The pressure head 123 is arranged above the supporting table 120, the pressure head 123 can move up and down through a driving device, and the screw rod 200 to be straightened is pressed, so that the straightening effect is realized. When the deformation track of the screw 200 to be straightened is measured, the supporting frame 115 is contracted back to the bottom of the workbench 110, and the supporting frame 115 does not influence the movement of the clamping seat 111. When the deformation track measurement of the screw rod 200 to be straightened is completed, and the screw rod 200 to be straightened needs to be straightened, the supporting frames 115 move along the axial direction perpendicular to the screw rod 200 to be straightened under the action of the driving device until the screw rod 200 to be straightened is supported, the pressure head 123 is positioned between the two supporting frames 115, the pressure head 123 moves downwards under the action of the driving device until the pressure head 123 abuts against the maximum deformation position, the clamping jaws 112 loosen the two ends of the screw rod 200 to be straightened, and the pressure head 123 continues to move downwards to press the maximum deformation position, so that the straightening effect is realized.
Furthermore, the pressure generated by the pressure head 123 is more than or equal to the yield strength of the screw rod 200 to be straightened, the pressure is kept for 5-10 seconds after the pressure head 123 is pressed in place, and only the pressure is slightly more than the yield strength and kept for a certain time, the screw rod can be slightly straightened and deformed so as to counteract the deformation of the screw rod 200 to be straightened without rebound, and the straightening effect is optimal.
In the present invention, the control system 130 is disposed on the workbench 110 and includes a display screen and an operation panel, the control system 130 can receive signals of the strain gauge 125, the claw 112, the support frame 115 and the pressure head 123 and translate the signals, and the control system 130 can drive movements of the claw 112, the support frame 115 and the pressure head 123 to realize detection and alignment of the screw 200 to be aligned, and specific operation steps will be described in detail in the following screw alignment method.
Further, the supporting seat 116 is disposed on one side of the clamping seat 111 facing the screw 200 to be straightened, during the process of straightening the screw, the clamping jaw 112 must loosen the screw 200 to be straightened, otherwise, the pressure generated by the pressure head 123 on the screw 200 to be straightened is transmitted to two ends of the screw 200 to be straightened, if the clamping jaw 112 cannot release the pressure, the straightening effect is affected, and the screw 200 and the clamping jaw 112 to be straightened are damaged. After the jaw 112 loosens the screw rod 200 to be straightened, if there is not enough supporting force to support the screw rod 200 to be straightened, the screw rod 200 to be straightened easily rolls or moves, so that the alignment cannot be accurately positioned, the alignment effect is affected, the screw rod 200 to be straightened is supported by the supporting seat 116, the screw rod 200 to be straightened is effectively supported, and the screw rod 200 to be straightened is prevented from rolling or moving.
As shown in fig. 8, the method for straightening the screw by using the screw straightening device comprises the following steps:
s1: two ends of a screw rod 200 to be straightened are fixed in the clamping jaw 112, the two ends of the screw rod 200 to be straightened form a straight line, and a deformation threshold is set as a reference shaft;
s2: the nut 1201 is sleeved at one end of the screw rod 200 to be straightened, the screw rod 200 to be straightened rotates and moves axially, the nut 1201 moves from one end to the other end relative to the screw rod 200 to be straightened, the control system 130 collects and converts the strain gauge 125 signals to form a three-dimensional model of the screw rod 200 to be straightened, and the control system 130 automatically determines the maximum deformation position and the maximum deformation amount;
s3: comparing the maximum deformation with a deformation threshold, if the maximum deformation is greater than the deformation threshold, entering S4, and if the maximum deformation is less than or equal to the deformation threshold, entering S6;
s4: the jaw 112 is rotated by the control system 130 to adjust the maximum deformation position to move below the pressing head 123, the support frame 115 is moved upwards to support the screw rod 200 to be straightened, the nut 1201 is removed, the pressing head 123 is aligned with the maximum deformation position, the jaw 112 is moved downwards until the pressing head 123 abuts against the maximum deformation position, the jaws 112 loosen the two ends of the screw rod 200 to be straightened, and the pressing head 123 is continuously moved downwards to press the maximum deformation position, so that the straightening effect is realized;
s5: the pressure head 123 returns, the clamping jaws 112 clamp the two ends of the screw rod 200 to be straightened, the supporting frame 115 returns, and the step S2 is repeated;
s6: the alignment process is completed, the claw 112 is released, and the screw 200 to be aligned is removed.
Specifically, in S2, the to-be-straightened screw 200 may be moved by the driving device to drive the jaw 112 or drive the chuck 111.
Jaw drive scheme: the claw 112 drives the screw rod 200 to be straightened to axially rotate relative to the nut 1201 under the action of the driving device, and due to the design of the thread shape, the screw rod 200 to be straightened must simultaneously axially move, and the clamping seat 111 and the screw rod 200 to be straightened synchronously move until the screw rod 200 to be straightened moves from one end to the other end relative to the nut 1201.
The driving scheme of the clamping seat is as follows: the clamping seat 111 drives the screw rod 200 to be straightened to axially move under the action of the driving device, the clamping seat 111 pushes the screw rod 200 to be straightened to axially move, and the screw rod 200 to be straightened axially rotates relative to the nut 1201 to drive the clamping jaw 112 to synchronously rotate. In this solution, the clamping seat 111 is actively moved by the driving means, and the clamping jaw 112 is passively rotated.
Further, in S1, the setting of the deformation threshold may be determined according to the type of the screw and the specific requirements for use of the screw.
Further, the nut 1201 includes a first nut block 121 and a second nut block 122, the first nut block 121 and the second nut block 122 being disposed on both sides of the support table 120, respectively; in S2, the first nut block 121 and the second nut block 122 can be extended along the direction perpendicular to the axial direction of the screw rod 200 to be straightened under the action of the driving device to combine the two to form a nut 1201 integrally sleeved at one end of the screw rod 200 to be straightened; in S4, the removal nut 1201 is separated by the first nut block 121 and the second nut block 122 shrinking in the direction perpendicular to the axial direction of the screw 200 to be straightened under the action of the driving device, so as to implement the action of removing the nut 1201. The nut 1201 is effectively simplified to be installed and removed, and the problem that the screw 200 to be straightened cannot be accurately determined in the maximum deformation position of the screw 200 to be straightened because the screw 200 to be straightened must be integrally moved to enable the nut 1201 to be moved to one end of the screw 200 to be straightened and then sleeved or moved out in the integral nut installation and removal process is avoided.
Further, a supporting seat 116 is disposed on a side of the clamping seat 111 facing the screw 200 to be straightened, and when the clamping jaw 112 releases the screw 200 to be straightened, the supporting seat 116 can provide support for the screw 200 to be straightened. In step S4: the jaw 112 is rotated and adjusted to move to the position below the pressing head 123 through the control system 130, the support frame 115 moves upwards to support the screw rod 200 to be straightened, the nut 1201 is removed, the pressing head 123 is aligned to the position of maximum deformation, the jaw 112 moves downwards until the pressing head 123 abuts against the position of maximum deformation, the jaw 112 loosens two ends of the screw rod 200 to be straightened, the two ends of the screw rod 200 to be straightened abut against the support seats 116 at the two ends, the support seats 116 provide support for the screw rod 200 to be straightened, and the pressing head 123 continues to move downwards to press the position of maximum deformation, so that the straightening effect is achieved.
[ second embodiment ]
Referring to fig. 7, in a specific embodiment, an ultrasonic vibration generating device 124 is provided on the ram 123, and specifically, ultrasonic vibration generated by the ultrasonic vibration generating device 124 is high-frequency vibration in the vertical direction. In S4, the ultrasonic vibration generating device 124 is provided on the ram 123, and ultrasonic vibration is simultaneously started when the ram 123 is pressed down. Further, the pressure generated by the pressure head 123 is more than or equal to the yield strength of the lead screw 200 to be straightened, and the pressure is kept for 5-10 seconds after the pressure head 123 is pressed in place.
When the screw rod 200 to be straightened is pressed, if the pressure is smaller, the deformation of the screw rod 200 to be straightened belongs to elastic deformation if the yield strength of the screw rod 200 to be straightened is not reached, and when the pressure is withdrawn, the screw rod 200 to be straightened rebounds. If the pressure is large, the yield strength of the screw rod 200 to be straightened is greatly exceeded, and the screw rod 200 to be straightened is easy to generate excessive plastic deformation, further breaks and cannot be recovered.
The high-frequency vibration generated by the ultrasonic vibration generating device 124 is overlapped with the pressure, so that the pressure forms a quick impact state near the critical value of the yield strength of the screw rod 200 to be straightened, the screw rod 200 to be straightened can reach the required straightening deformation amount more quickly, the deformation of the screw rod 200 to be straightened is counteracted, the screw rod 200 to be straightened cannot rebound, the straightening effect is optimal, and the screw rod 200 to be straightened is not easy to rebound.
[ third embodiment ]
In a specific embodiment, one end of the workbench 110 is provided with a clamping seat 111, the clamping seat 111 is provided with a clamping jaw 112, the other end of the workbench 110 is provided with an abutting seat, one end of the screw rod 200 to be straightened is fixed in the clamping jaw 112, and the other end abuts against the abutting seat. The screw rod 200 to be straightened is driven by a single-ended driving device to axially rotate and move, and the abutting seat can ensure the balance of the screw rod to be straightened, so that the structural complexity is reduced.
The above arrangement may also be provided in other embodiments, and the scope of the present invention includes, but is not limited to, those listed in this embodiment.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (9)
1. A lead screw straightening device, comprising: a main body (100), wherein a workbench (110) and a supporting table (120) are arranged on the main body (100); the supporting table (120) is erected on the workbench (110); characterized by further comprising:
the clamping seat (111) is arranged at least one end of the workbench (110) and is used for fixing a screw rod (200) to be straightened, a clamping jaw (112) is arranged on the clamping seat (111), the clamping jaw (112) can drive the screw rod (200) to be straightened to rotate and move in the axial direction, and the clamping seat (111) and the clamping jaw (112) can move synchronously in the axial direction;
the nut (1201) is sleeved on the screw rod (200) to be straightened, a strain gauge (125) is arranged on the nut (1201), when the nut (1201) moves from one end to the other end relative to the screw rod (200) to be straightened, the deformation of the nut (1201) is transmitted to the nut (1201) through a deformation area of the screw rod (200) to be straightened, and the strain gauge (125) receives a deformation signal of the nut (1201) and converts the deformation signal into a deformation track of the screw rod (200) to be straightened, so that the maximum deformation position and the maximum deformation amount of the screw rod (200) to be straightened are determined;
the support frame (115) is arranged at the bottom of the workbench (110), and the support frame (115) can move up and down along the direction perpendicular to the axial direction of the screw (200) to be straightened;
the pressure head (123) is arranged above the supporting table (120), and the pressure head (123) can move up and down through a driving device to press the lead screw (200) to be straightened, so that the straightening effect is achieved;
the control system (130) is arranged on the workbench (110) and comprises a display screen and an operation panel, and the control system (130) can receive the strain gauge (125) and the clamping jaw (112); and/or signals of the clamping seat (111), the supporting frame (115) and the pressure head (123) are translated, and the control system (130) can drive the clamping jaw (112); and/or movement of the cartridge (111), the support (115), and the ram (123);
the nut (1201) comprises a first nut block (121) and a second nut block (122), the first nut block (121) and the second nut block (122) are respectively arranged on two sides of the supporting table (120), the first nut block (121) and the second nut block (122) can stretch along the direction perpendicular to the axial direction of the screw rod (200) to be straightened under the action of the driving device, the two blocks are combined, the nut (1201) is formed, the nut (1201) is integrally sleeved on the screw rod (200) to be straightened, or the first nut block (121) and the second nut block (122) shrink along the direction perpendicular to the axial direction of the screw rod (200) to be straightened under the action of the driving device to realize the separation of the two blocks.
2. Screw straightening device according to claim 1, characterized in that the strain gauge (125) is glued inside the nut (1201) for detecting the deformation of the nut (1201).
3. The screw straightening device according to claim 1, characterized in that a supporting seat (116) is arranged on one side of the clamping seat (111) facing the screw (200) to be straightened, and when the clamping jaw (112) loosens the screw (200) to be straightened, the supporting seat (116) supports the screw (200) to be straightened.
4. Screw straightening device according to claim 1, characterized in that the ram (123) is provided with ultrasonic vibration generating means (124).
5. A screw straightening method, characterized in that the screw straightening method is applied to the screw straightening device according to any one of claims 1 to 4, and specifically comprises the following steps:
s1: the two ends of the screw rod to be straightened are fixed in the clamping jaw, the two ends of the screw rod to be straightened form a straight line, and the straight line is used as a reference shaft to set a deformation threshold;
s2: the nut is sleeved at one end of the lead screw to be straightened, the lead screw to be straightened rotates and moves axially, the nut moves from one end to the other end relative to the lead screw to be straightened, the control system collects and converts strain gauge signals to form a three-dimensional model of the lead screw to be straightened, and the control system automatically determines the maximum deformation position and the maximum deformation amount;
s3: comparing the maximum deformation amount with a deformation threshold, if the maximum deformation amount is greater than the deformation threshold, entering S4, and if the maximum deformation amount is less than or equal to the deformation threshold, entering S6;
s4: the jaw is rotated and adjusted to move below the pressing head through the control system, the support frame moves upwards to support the screw rod to be straightened, the nut is removed, the pressing head is aligned to the maximum deformation position and moves downwards until the pressing head abuts against the maximum deformation position, the jaw loosens two ends of the screw rod to be straightened, and the pressing head continues to move downwards to press the maximum deformation position, so that the straightening effect is achieved;
s5: the pressure head returns, the clamping jaws clamp the two ends of the screw rod to be straightened, the supporting frame returns, and the step S2 is repeated;
s6: and (5) ending the straightening process, loosening the clamping jaw, and taking down the lead screw to be straightened.
6. The method of aligning a lead screw according to claim 5 wherein in S4 the pressure generated by the ram is greater than or equal to the lead screw yield strength and the ram is held in place for 5-10 seconds after pressing.
7. The screw straightening method according to claim 5, characterized in that in S4, an ultrasonic vibration generating device is provided on the ram, and ultrasonic vibration is simultaneously started when the ram is pressed down.
8. The screw straightening method according to claim 7, characterized in that in S4, the ultrasonic vibration generated by the ultrasonic vibration generating device is high-frequency vibration in a vertical direction.
9. The method of aligning a lead screw as claimed in claim 5 wherein the nut includes a first nut block and a second nut block, the first nut block and the second nut block being disposed on both sides of the support table, respectively; in S2, the first nut block and the second nut block can stretch along the direction perpendicular to the axial direction of the screw rod to be straightened under the action of the driving device, so that the first nut block and the second nut block are combined, and the nut is integrally sleeved at one end of the screw rod to be straightened; in S4, the nut removing is that the first nut block and the second nut block shrink along the direction perpendicular to the axial direction of the screw rod to be straightened under the action of the driving device to realize the separation of the first nut block and the second nut block, so that the nut removing action is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310134682.4A CN115815375B (en) | 2023-02-20 | 2023-02-20 | Lead screw straightening device and straightening method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310134682.4A CN115815375B (en) | 2023-02-20 | 2023-02-20 | Lead screw straightening device and straightening method thereof |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5698329B1 (en) * | 2013-10-11 | 2015-04-08 | 株式会社日進製作所 | Ball screw thermal displacement compensation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR922797A (en) * | 1946-01-04 | 1947-06-18 | Mechanical parts verification and rectification bench | |
| SU860390A1 (en) * | 1980-04-01 | 1985-07-30 | Московское Особое Конструкторское Бюро Металлорежущих Станков | Device for determining position of pipe joint |
| CN204523864U (en) * | 2015-03-13 | 2015-08-05 | 天津海特传动机械有限公司 | A kind of hydraulic straightening machine |
| JP3215097U (en) * | 2017-11-15 | 2018-03-01 | 運華 李 | Guide post of hydraulic straightener for shaft parts |
| CN208213980U (en) * | 2018-05-15 | 2018-12-11 | 威奥博仕机器人（昆山）有限公司 | Lead screw straightener |
| CN110538896A (en) * | 2019-09-09 | 2019-12-06 | 东莞市凯勒帝数控科技有限公司 | Automatic straightening device for shaft parts |
| CN113351691B (en) * | 2021-06-18 | 2022-08-16 | 浙江明贺钢管有限公司 | Full-automatic heavy-calibre steel pipe point correction equipment |
| CN215236941U (en) * | 2021-07-02 | 2021-12-21 | 福建隆源纺织有限公司 | Straightener for guide roller shaft of high-speed drawing frame |
| CN217384097U (en) * | 2022-05-17 | 2022-09-06 | 四川博正达机械密封件科技有限公司 | Shaft body bending degree inspection and calibration device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5698329B1 (en) * | 2013-10-11 | 2015-04-08 | 株式会社日進製作所 | Ball screw thermal displacement compensation device |
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